Temperature and light requirements for growth of two diatom species (Bacillariophyceae) isolated from an Arctic macroalga

In the present study, two abundant epiphyticdiatom taxa were isolated from the assimilation hairs ofthe brown macroalga Chordaria flagelliformis collected inthe Arctic Kongsfjorden (Spitsbergen, Norway), establishedas unialgal cultures and their growth rates determinedunder controlled photon fluence rate andtemperature conditions. Using morphological (light andscanning electron microscopy) and SSU rRNA gene databoth isolates (ROS D99 and ROS D125) were identifiedas members of a FragilariaSynedropsis clade. Themolecular data of ROS D99 and ROS D125 were notidentical to any other published sequence. While ROSD99 has been identified as Fragilaria barbararum mainlydue to the SEM characteristics, ROS D125 could not bedefinitely identified although morphological data speakfor Fragilaria striatula. Both diatom species showedsimilar growth rates at all temperatures and photon fluencerates tested. They grew well between 0 and 15Cwithoptimum temperatures of 1214C, but did not survive20C. Therefore, compared to Antarctic diatoms bothtaxa from Kongsfjorden can be characterised as eurythermalorganisms. Increasing photon fluence rates between2 and 15 lmol m2 s1 were accompanied with analmost twofold increase in growth rates, but photon fluencerates >15 lmol m2 s1 did not further enhancegrowth pointing to low light requirements. From thesedata optimum, minimum and maximum photon fluencerates and temperatures for growth can be assessed indicatingthat both diatoms are well acclimated to the fluctuatingenvironmental conditions in the Arctic habitat

Stability of the pentaquark in a naive string model

The pentaquark is studied in a simple model of confinement where the quarks and the antiquark are linked by flux tubes of minimal cumulated length, and the Coulomb-like interaction, the spin-dependent terms and the antisymmetrization constraints are neglected.. The ground-state is found to be stable against spontaneous dissociation into a meson and a baryon, both in the case of five equal-mass constituents and for a static quark or antiquark surrounded by four equal masses.Comment: 8 pages, 2 figures, minor corrections, references added, to appear in Phys. Rev.

Exotic medicinal plants from West Vidarbha region - V

Exotics are those plants which are migrated from one region to other region. They are also known as immigrants. Such a plants are now a days considered as a part of forest vegetation because they mixed with the natural floras. About 40% exotics are found in a indigenous floras, their exact time of arrival is different. Some of the plants are migrated from cultivated field or garden due to careless attention. These are considered as naturalized aliens. The present work deals with the report of 26 medicinally important exotics from Vidarbha region

A role of Immigrants and Indigenous plants in forest improvement from West Vidarbha region

Present investigation deals with the report of immigrants and indigenous plant that improves the forest vegetation as well as balancing an environment from west vidarbha region of Maharashtra state. In all a list of 75 immigrants and 51 indigenous plants. Thus a list of 126 plants with their role is described

Lattice oscillator model, scattering theory and a many-body problem

We propose a model for the quantum harmonic oscillator on a discrete lattice which can be written in supersymmetric form, in contrast with the more direct discretization of the harmonic oscillator. Its ground state is easily found to be annihilated by the annihilation operator defined here, and its excitation spectrum is obtained numerically. The versatility of the model is then used to calculate, in a simple way, the generalized position-dependent scattering length for a particle colliding with a single static impurity in a periodic potential and the exact ground state of an interacting many-body problem in a one-dimensional ring.Comment: 3 Figures. Version accepted in J. Phys.

Diversity of ornamental trees from Amravati city of West Vidarbha region

The present study deals with the diversity of ornamental trees from Amravati District of West Vidarbha region of Maharashtra. All these ornamental trees show diversity in their habitat, floral structure, flowering period, etc. In the present investigation, extensive field surveys were conducted in the different localities of Amravati district during 2005-2011containing description, distribution, origin, vegetative and flowering period of 25 ornamental trees species from 19 families with their photographs and preserved as Herbaria

Qualitative phytochemical screening of indian witchweed: Striga asiatica (L.) O. Ktze - an unexplored medicinal parasitic plant

Many herbal remedies have been employed in various medical systems for the treatment of different diseases. The parasitic plant Striga asiatica (L.) O. Ktze commonly known as witch weed belongs to family Scrophulariaceae has been used in different system of traditional medicine for curing various diseases and ailments of human beings. The present study deals with the qualitative phytochemical screening of Striga asiatica (L.) O. Ktze of whole plant powder in six different extracts (i.e. petroleum ether, benzene, chloroform, acetone, ethanol and water). The extracts showed the prominently presence of phytoconstituents like carbohydrates, cardiac glycosides, alkaloids, flavonoids, tannin, phenolics, steroids, coumarins and saponin. However anthroquinone glycosides and quinone are totally absent in all extracts. Most of the phytoconstituents from Striga asiatica (L.) O. Ktze lacks the reports of pharmacological activities, which support its further pharmacological studies

Preliminary phytochemical investigation of Combretum albidum G. Don; An ignored medicinally important liana.

Day by day faith of people on herbal medicine is increases due to the side effect of synthetic drugs, and results into people started looking back to the traditional knowledge of plant for their health care in day to day life. Certain local practitioner, traditional healers uses the decoction of the fruit of Combretum albidum G. Don in the treatment of diarrhoea and dysentery, stem barks used in jaundice. So the present study deals with preliminary phytochemical analysis of stem, leaf, flower and fruit using six different solvent. It needful helps for the scientific documentation and standardization of row plant material used in medicine and its worldwide acceptance.&nbsp

Studies on antibacterial activity of some plant extracts

The antibacterial activity of the extracts of Melia azedarch (L), Spilanthes paniculata (L, f), Oxalis Corniculata, Colocassic esculenta (L), and Hyptis suaveolens (L) were evaluated against five bacteria isolated from semen samples (E. coli., S. aureus, P. vulgaris, P. aeruginosa and B. subtilis). These plants are used in medicine to treat infections of microbial origin